SpringBoot拦截器实现登录拦截的示例代码

本文主要介绍了SpringBoot拦截器实现登录拦截，文中根据实例编码详细介绍的十分详尽，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

可以对URL路径进行拦截，可以用于权限验证、解决乱码、操作日志记录、性能监控、异常处理等

实现代码

新建 interceptor包

添加拦截器代码

package com.qcby.interceptor; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.method.HandlerMethod; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class LoginInterceptor  implements HandlerInterceptor { @Autowired private HttpSession httpSession; //Controller逻辑执行之前 @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("preHandle...."); String uri = request.getRequestURI(); System.out.println("当前路径"+uri); /** * HandlerMethod=>Controller中标注@RequestMapping的方法 *  需要配置静态资源不拦截时，添加这块逻辑  => 前后端分离项目 */ if (!(handler instanceof HandlerMethod)) { return true; } if (httpSession.getAttribute("username") == null) { // 未登录跳转到登录界面 throw  new RuntimeException("no login!"); } else { return true; } } //Controller逻辑执行完毕但是视图解析器还未进行解析之前 @Override public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { System.out.println("postHandle...."); } //Controller逻辑和视图解析器执行完毕 @Override public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { System.out.println("afterCompletion...."); } }

package com.qcby.config; import com.qcby.interceptor.LoginInterceptor; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; @Configuration public class WebMvcConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(loginInterceptor()) .addPathPatterns("/**") // 那些路径不拦截 .excludePathPatterns("/user/login","/error"); } @Bean public LoginInterceptor loginInterceptor(){ return new LoginInterceptor(); } }

实现类

@RestController @RequestMapping("user") public class UserController { @Autowired private UserService userService; @Autowired private HttpSession session; @ApiOperation("用户登录接口") @RequestMapping(value="login",method = {RequestMethod.GET,RequestMethod.POST}) public Maplogin(User user){ Map map=new HashMap<>(); map.put("code",0); if(StringUtils.isEmpty(user.getUsername())||StringUtils.isEmpty(user.getPassword())){ map.put("msg","用户或密码为空！"); return map; } QueryWrapper queryWrapper=new QueryWrapper<>(); queryWrapper.eq("username",user.getUsername()) .eq("password",user.getPassword()); User user1=userService.getOne(queryWrapper); if(user1!=null){ map.put("cod",1); map.put("data",user1); session.setAttribute("username",user1.getUsername()); }else { map.put("msg","用户名或密码错误!"); } return map; } }

当我们未登录时我们不能进入拦截的页面